231PA 235NP A DECAY (396.1 D) 1973BR12 22NDS 202210
231PA H TYP=FUL$AUT=Balraj Singh, Jagdish K. Tuli, and Edgardo Browne$
231PA2 H CIT=NDS 185, 560 (2022)$CUT=31-Aug-2022$
231PA c 1973Br12 (also 1970BrZX): {+235}Np produced in {+235}U(d,2n),E(d)=12
231PA2c MeV using an enriched target, followed by chemical separation. Measured
231PA3c E|a, I|a, E|g, I|g, |a|g-coin using semiconductor detector for |a
231PA4c particles with FWHM=14.5 keV, and Ge(Li) detector for |g rays. A
231PA5c magnetic field to the source was applied to reduce spurious peaks in
231PA6c the singles |a spectrum, caused by the true coincidences between
231PA7c conversion electrons and |a particles.
231PA c 1986AgZV: measured %|a branching ratio from the decay of {+235}Np.
231PA c Others:
231PA c 1987Ha07: {+235}Np produced in {+238}U(p,4n),E(p)=50 MeV reaction.
231PA2c Measured E|a, I|a, x rays.
231PA c 1984Wh02: {+235}Np produced in {+235}U(p,n),E(p)=50 MeV reaction.
231PA2c Measured x ray and |a spectra, the latter with peaks at 4.88 and
231PA3c 4.96 MeV. Deduced %|a branching ratio from {+235}Np decay
231PA c 1958Gi05, 1957Th37, 1956Ho46: measured %|a branching ratio from
231PA2c {+235}Np decay
231PA c Evaluators' note: the decay scheme seems fairly complete, except for
231PA2c spectral information about low-energy |g transitions of 9.18 and
231PA3c 17.19 keV
231PA cA E$From 1973Br12, recalibrated by 1991Ry01. Recalibrated values given
231PA2cA here are |?2 keV higher than those deduced from Q(|a) (2021Wa16).
231PA cA HF$The nuclear radius parameter r{-0}({+231}Pa)=1.51623 {I36}
231PA2cA is deduced from interpolation (or unweighted average) of radius
231PA3cA parameters of the adjacent even-even nuclides, as given in 2020Si16,
231PA4cA and in the data file of the ALPHAD-RadD code.
231PA cA E$Evaluators have adjusted by 9 keV E|a values from 1960Gi03 given in
231PA2cA comments. Original E|a are relative to {+237}Np(86|a)=4781 keV. Values
231PA3cA given here are relative to {+237}Np(86|a)=4789.8 (1991Ry01).
231PA cG E$From the Adopted Gammas, which are mostly from {+231}Th |b{+-} decay,
231PA2cG as these are most precisely known. Exceptions are noted
231PA cG E(a)$|g not seen in 1973Br12, only an upper limit is given
231PA cG RI$From 1973Br12 per 100 decays of |a particles, unless otherwise
231PA2cG specified.
231PA cG RI(b)$From |g-branching ratios in the Adopted Gammas, which are mostly
231PA2cG from {+231}Th |b{+-} decay
231PA cG TI(d)$From |g-ray transition intensity balance at 84-, 101-, and
231PA2cG 102-keV levels, and |g-ray data from {+231}Th |b{+-} decay.
231PA cG M,MR$From the Adopted Levels, Gammas dataset
231PA cL E$From least-squares fit to E|g data
231PA cL J,T$From the Adopted Levels
231PA cL E(A)$Proposed member of configuration=|p1/2[530] (1973Br12)
231PA cL E(B)$Proposed member of configuration=|p3/2[651] (1973Br12)
231PA cL E(C)$Proposed member of configuration=|p5/2[642] (1973Br12)
235NP P 0 5/2+ 396.1 D 12 5193.8 15
235NP cP J,T$From {+235}Np Adopted Levels in the ENSDF database
235NP2cP (Feb 2014 update). No new experimental references for half-life
235NP3cP after this update.
235NP cP QP$From 2021Wa16
231PA N 1.0 1.0 2.60E-5 13
231PA PN 4
231PA cN NR$The |g-ray intensities in 1973Br12 are per 100 |a decays,
231PA2cN deduced from their |a|g-coin results
231PA cN BR$%|a=0.00260 {I13} (1986AgZV, measurement of x-rays from {+235}Np
231PA2cN and {+236}Np |e decay, and alpha particles from {+237}Np |a decay).
231PA3cN Others: %|a=0.0035 {I4} (1956Ho46, I|a/K| x ray+L| x ray, it is not
231PA4cN clear whether correction for |eM+ had been applied); 0.0012 {I1}
231PA5cN (1957Th37); 0.00159 (1958Gi05, I|a/K| x ray+L| x ray, with correction
231PA6cN for |eM+/|eL=0.46); |?0.002 (1984Wh02, K| x ray/I|a).
231PA G 126 2 0.3 2
231PA2 G %IG=8E-6 5$
231PA cG E$from 1973Br12. This |g seems different from the 125|g from 247 level
231PA L 0.0 3/2- 32570 Y 130 A
231PA A 5108 3 1.5 2 348 51
231PA cA $E|a=5105 {I3} (1973Br12). E|a=5104 keV {I5}, I|a=3.8 (1960Gi03).
231PA L 9.2 10 1/2- A
231PA A 5100 3 0.2 AP 2200 AP
231PA cA $E|a=5097 {I3} (1973Br12)
231PA G 9.183 S
231PA cG E$from the Adopted Gammas
231PA L 58.570 3 7/2- 274 PS 10 A
231PA A 5051 2 1.8 3 119 21
231PA cA $E|a=5048 {I2} (1973Br12)
231PA G 58.5700 24 0.50 3 E2 155.5 22 C
231PA2 G %IG=1.30E-5 10$
231PAS G LC=113.6 16$MC=31.3 5
231PAS G NC=8.43 12$OC=1.90 3$PC=0.306 5$QC=0.000818 12
231PA cG E$58.5 {I4} (1973Br12)
231PA cG $I|g=0.6 {I2} (1973Br12) is imprecise. I|g=0.50 {I3} deduced by
231PA2cG evaluators from I|g(25.6)=14.3 {I7}, I|a(58)=1.8 {I3}, and intensity
231PA3cG balance at 58-keV level.
231PA L 84.2152 20 5/2+ 45.1 NS 13 B
231PA cL T$other: 37 ns {I4} (1956Ho46, delayed coincidence)
231PA cL $Proposed configuration=|p3/2[651] (1973Br12)
231PA A 5025 2 53 8 2.8 5
231PA cA $E|a=5022 {I2} (1973Br12)
231PA cA $I|a=48 {I11}, deduced by evaluators from |g-ray transition intensity
231PA2cA balance.
231PA cA $E|a=5024 keV {I5}, I|a=83.6 (1960Gi03).
231PA cA HF$Low alpha hindrance factor is due to strong mixing of this 5/2+,
231PA2cA 3/2[651] state with the 5/2+, 5/2[642] favored state at 183.5 keV
231PA3cA through the Coriolis interaction.
231PA G 25.65 2 14.3 7 E1 4.37 6 b S
231PA2 G %IG=0.000372 26$
231PAS G LC=3.26 5$MC=0.843 12$
231PAS G NC=0.219 4$OC=0.0471 7$PC=0.00673 10$QC=0.000196 3
231PA G 84.2140 22 6.9 4 E1 2.17 21 C
231PA2 G %IG=0.000179 14$
231PA cG E$84.2 {I1} (1973Br12)
231PA cG M$Anomalous E1 |g ray. Total conversion coefficient from
231PA2cG {+231}Th |b{+-} decay
231PA L 101.409 4 7/2+ 0.7 NS 2 B
231PA A 5008 4 24 8 4.7 16
231PA cA $E|a=5004 {I4} (1973Br12)
231PA cA $I|a=33 {I10}, deduced by evaluators from |g-ray transition intensity
231PA2cA balance.
231PA G 17.195 21 (M1) 166 3 39 10d S
231PAS G LC=1.4$ MC=122.6 18$ NC=32.7 5$OC=7.75 12$PC=1.505 22$QC=0.144 2
231PA L 102.2687 21 3/2+ 0.7 NS 2 B
231PA A 5007 AP 0.5 LE 210 GE ?
231PA cA $I|a=-2.7 {I22} from transition intensity balance,
231PA G 18.055 18 M1+E2 0.040 +18-0 218 18 10 2 d S
231PAS G LC=45 15$MC=128 8
231PAS G NC=34 2$OC=8.1 4 $PC=1.55 5 $QC=0.124 1
231PA G 93.02 4 0.10 5 (E1) 0.1463 21 ? ?
231PA2 G %IG=2.6E-6 13$
231PA cG E$92.2 {I4} (1973Br12, uncertain |g)
231PAS G LC=0.1103 16$MC=0.0269 4
231PAS G NC=0.00711 10$OC=0.001633 23$PC=0.000279 4$QC=1.363E-5 20
231PA G 102.2700 24 0.30 6 (E1) 0.1141 16 C
231PA2 G %IG=7.8E-6 16$
231PA cG E$102.2 {I4} (1973Br12)
231PAS G LC=0.0860 12$MC=0.0210 3
231PAS G NC=0.00554 8$OC=0.001276 18$PC=0.000220 3$QC=1.107E-5 16
231PA L 111.647 13(9/2+) B
231PA A 4997 4 6 AP 16 AP
231PA cA $E|a=4994 {I4} (1973Br12)
231PA G 53.2 8 3.7 AP [E1] 0.64 3 6 AP S
231PA2 G %IG AP 9.5E-5 $
231PA cG TI$from I|a value, if 53.2|g is the only decaying transition
231PA cG RI$from I(|g+ce) and |a
231PAS G LC=0.483 21$MC=0.119 6
231PAS G NC=0.0313 14$OC=0.0070 3$PC=0.00114 5$QC=4.53E-5 16
231PA L 169.4 4 11/2-
231PA A 4940 6 0.6 AP 68 AP
231PA cA $E|a=4937 {I6} (1973Br12)
231PA cA $I|a=0.8 {I3}, deduced by evaluators from |g-ray transition intensity
231PA2cA balance.
231PA G 110.8 4 0.09 3 (E2) 7.60 11 C
231PA2 G %IG=2.3E-6 8$
231PA cG E$from 1973Br12
231PAS G LC=5.55 13$MC=1.53 4$
231PAS G NC=0.414 9$OC=0.0936 21$PC=0.0152 4$QC=6.79E-5 13
231PA L 174 1 (5/2-) ?
231PA A 4934 0.1 LT 360 GT ?
231PA cA IA$upper limit from I|g values from 174 level
231PA G 89.95 2 0.07 LT (E1) 0.159823 a ?
231PA2 G %IG LT 1.8E-6 $
231PAS G LC=0.1205 17$MC=0.0294 5
231PAS G NC=0.00777 11$OC=0.001782 25$PC=0.000304 5$QC=1.467E-5 21
231PA G 174.15 2 0.007 LT [M1+E2] 2.7 15 a ?
231PA2 G %IG LE 1.8E-7 $
231PAS G KC=1.8 16$LC=0.68 4$MC=0.177 22
231PAS G NC=0.048 6$OC=0.0111 11$PC=0.00196 6$QC=8.7E-5 71
231PA L 183.4956 25 5/2+ 0.19 NS LE C
231PA A 4925 2 11.5 5 2.88 20
231PA cA $E|a=4922 {I2} (1973Br12)
231PA cA $I|a=20.1 {I11}, deduced by evaluators from |g-ray transition intensity
231PA2cA balance.
231PA cA HF$Low alpha hindrance factor is consistent with 5/2+, 5/2[642] favored
231PA2cA state assignment.
231PA cA $E|a=4934 keV {I5}, I|a=11.8 (1960Gi03).
231PA G 81.2280 21 1.5 1 M1(+E2) 0.00 8 7.66 20 C
231PA2 G %IG=3.90E-5 33$
231PA cG E$81.2 {I2} (1973Br12)
231PAS G LC=5.78 14$MC=1.40 4
231PAS G NC=0.374 11$OC=0.0898 24$PC=0.0172 4$QC=0.001422 22
231PA G 82.0870 22 0.70 5 M1(+E2) 0.04 6 7.47 23 b S
231PA2 G %IG=1.82E-5 16$
231PAS G LC=5.63 17$MC=1.36 5
231PAS G NC=0.365 12$OC=0.088 3$PC=0.0167 5$QC=0.001377 22
231PA G 99.2780 36 0.22 2 M1+E2 0.35 7 5.2 4 b S
231PA2 G %IG=5.7E-6 6$
231PAS G LC=3.9 3$MC=0.97 8
231PAS G NC=0.261 20$OC=0.062 5$PC=0.0113 7$QC=0.00072 3
231PA G 124.927 18 0.07 3 (E1) 0.294 4 C
231PA2 G %IG=1.8E-6 8$
231PA cG E$125 {I1} (1973Br12)
231PAS G KC=0.226 6$LC=0.0510 13$MC=0.0124 4$
231PAS G NC=0.00328 9$OC=0.000759 19$PC=0.000133 4$QC=7.11E-6 17
231PA G 183.489 20 0.04 3 (E1) 0.1181 17 C
231PA2 G %IG=1.0E-6 8$
231PA cG E$185 {I1} (1973Br12)
231PAS G KC=0.0928 13$LC=0.0191 3$MC=0.00463 7
231PAS G NC=0.001228 18$OC=0.000287 4$PC=5.13E-5 8$QC=3.05E-6 5
231PA L 247.317 6 7/2+
231PA A 4862 3 0.7 1 18 3
231PA cA $E|a=4859 {I3} (1973Br12)
231PA cA $I|a=0.8 {I3}, deduced by evaluators from |g-ray transition intensity
231PA2cA balance.
231PA cA $E|a=4873 keV {I5}, I|a=0.8 (1960Gi03).
231PA G 63.86 3 0.007 4 M1+E2 0.6 3 39 16 b S
231PA2 G %IG=1.8E-7 10$
231PAS G LC=28 12$MC=7.5 33
231PAS G NC=2.03 88$OC=0.47 20$PC=0.079 31$QC=0.0023 5
231PA G 135.670 11 0.026 16 M1(+E2) 0.1 +4-1 8.5 10 b S
231PA2 G %IG=7.E-7 4$
231PAS G KC=6.7 13$LC=1.32 17$MC=0.32 6
231PAS G NC=0.086 15$OC=0.021 4$PC=0.0039 5$QC=0.00032 6
231PA G 163.1010 54 0.05 3 M1(+E2) 0.0 3 5.1 3 C
231PA2 G %IG=1.3E-6 8$
231PA cG E$165 {I1} (1973Br12)
231PAS G KC=4.0 4$LC=0.776 19$MC=0.187 7
231PAS G NC=0.0502 19$OC=0.0120 4$PC=0.00230 5$QC=0.000190 15
231PA L 303 7 (9/2+) C ?
231PA A 4809 7 0.1 AP 52 AP ?
231PA cA $E|a=4806 {I7} (1973Br12)